Improvement in sewing-machines



2 Sheets-Sheet 1;;

J. J. SIBLEY.

Sewing Machine.

Patented March 29, 1864.

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J. J. SIBLEY.

Sewing Machine.

2 Sheets- Sheet 2 Patented March 29, 1864.

Wazwas @6 UNITED STATES PATE T ,Orr ce.

JOHN J. SIBLEY, OF NEW YORK, N. Y.

IMPROVEMENT INS EWlNG-MACHIN ES.

Specification forming part of Letters Patent N0.42,1 [7, dated March 29, 1864.

To all whom it may concern.-

Be it known that I, JOHN J. SIBLEY, of the city and county ,of New York, State of New York, have invented certain new and useful lmprovements in Sewing-Machines; and I do hereby declare that the followingis a full and correct description thereof, reference being had to the annexed drawings, and to the letters of reference thereon.

My said invention relates tothe sewing-machine well known as the \Vheeler 85 Wilson sewing-machine and its object is to enable said machine to sew the double-looped stitch, and also to change at pleasure from the lockstitch to thedouhle-looped stitch, or vice versa.

A part of my invention consists in combin-- .thread has been caught and spread by the rotating hook and the needle retracted, leaving its loop of needle-thread spread upon the book, as in the ordinary operation of the Wheeler& \Vilson sewinganachine, the under-thread carrier, with its thread, passes through said loop of needle-thread, carrying its own thread back of the track of the needle, in which position it remains untiltheneedle has again descended and retracted, thus introducing aloopot under thread through the loop of needle-thread, and holding the loop of under thread in positionfor the downward stroke of the needle to pass a loop of needle-thread through it, which is done by the needle descending in front of the thread-carrier and its thread. needle has again retracted, leaving its loop of needle-thread caught upon the rotating hook and interlooped with the under thread, the thread-carrier moves out in front of the rotating hook and loop of needle-thread. The loop ot' needle-thread being meantime spread open by the rotating hook, the under-thread carrier immediately moves in through said loop of needle thread, carrying its underv thread through the loop of needle-thread to a position back of the track of the needle, and holdingit there to be interlooped with the needle-thread vby the downstroke of the needle, as before, the result of the repetition of the movements As soon as the.

of the said Wheeler 85 Wilson sewing-machine; but, the bobbin and ring-slide being removed, a further provision is necessary to prevent the loop just beingcast ofi from the revolving book from fallin'g over and being again caught by the hook. herein described were so modified as to retain the bobbin (unthreaded) and a supportingring, such provision would not be necessary; but when the bobbin and ring are dispensed with it becomes necessary to detain the loop after it has escaped from the old or first pad or loop check by a second pad at a higher point on the revolving looper, where the loop, which is at this time rapidly shortening, may be detained without breakage, and this part of my invention further consists in the application and use of a second loop-pad, applied to the hook ata point higher up than the usual pad on the machine, for the purpose of preventing the loop just being thrown off from the hook from interfering with the formation of the stitcher.

My invention further. consists in organizing the under-thread carrier, together with the lever, by which motionis communicated to it in a frame separate from and independent of the sewing-machine frame, but adapted thereto in such manner, as is hereinafter more particularly described, that to change from the ordinary lock-stitch to the double-loop stitch the operator has only to remove and lay aside for the time the bobbin and ring-slide, to place the.

frame containing the separately organized thread-carrier in the place of the bobbin-ring slide, and screw it fast to the seat by a thumbscrew, the parts being so arranged that when this is done .the lever which operates the thread-carrieris brought into operative pros If the construction extended use in theUnited States and adjacent countries, making the lock-stitch only; and it is also well known that the different sizes of said machines are numbered, and that the respective parts of all the machines of a given size are made to conform to gages, so that the same parts of each machine of any given size are alike. Therefore there is no difficulty in making my separate organization of threadcarrier of different sizes, so as to be adapted to and correspond with every Wheeler & Wilson machine of the same numbered size; and thus my invention possesses great utility beyond adding a stitch to the Wheeler 81: Wilson sewing-machine,'because of its being applied to use in such manner that any one having a \Vheeler 8:, Wilson machine can, by sending the size, procure from a distance the separately-organized thread-carrier, and set it at work upon the machineas readily as a hemmer or other attachment to said machine.

But more particularly to describe my said invention, I will refer to the drawings by letters of reference.

Sheet 1 contains Figure 1, a side elevation of a Wheeler 86 Wilson sewingmachine having the bobbin and ring-slide removed and my improvements attached; and Fig. 2,.a top view of the same with the table removed in order to show the operative parts. Sheet Z-contains detached views of ditferent parts, the same letters of reference indicating the same parts in all the drawings.

The frame aof the separateorganization is secured to the seat of the removed ring-slide by the thumb-screw b, a gage-pin, 0, projecting from the frame a, determining its position. The under-thread carrier d is fast to and vibrates with the vertical axisor stem 6, which is held by and plays freely in a socket in the standardf. The thread-carrier is grooved in its periphery and contains the usual eye in the groove and through the end, the course of the thread from the spool being shown by the line a as. The thread-carrier is moved by a crooked arm, g, shaped as shown in the drawings,andnotched at the end next to the threadcarrier, so as to receive and take on a pin, h,

n i J ])I0J60tlllg trom the axis of the thread-carrier. The other end of the arm is fast to a vertical axis or rock-shaft, i, which rocks on center hearings on the ends of the screws jj, receivingits motion in one direction from the feed cam is by means of thearm I, attached to the rock-shaft by a set-screw, so as to be adjustable, and is moved in the opposite direction by the action of the spring at upon the arm g. The second pad n is secured to the frame a by the spring 0. The spool of under thread is supported by aspool-bearer,p, which is hinged to the frame a. at q, so as to be readily set in different position. An annular weight, 8, slipped on the spool-wire over the spool, or any suitable means of tension on the under thread, may be used. An adjusting-screw, 'i", determines the extent of motion of the lever that moves the thread-carrier.

khave shown the device that communicates motion from the cam thatadvances the cloth to the thread -carrier composed of several pieces; but the same may be readily made in one piece, if desired. By thus taking the motion for the thread-carrier from the cam employed to advance the cloth, and by so eon strncting and organizing the thread-carrier and other separately -0rganized mechanism that it can be at once brought into co-opera' tive action with the operative parts of the Wheeler 85 \Vilson machine, without other change than to lay aside for the time the bobbin and ring-slide, I have succeeded in pro dncing a valuable result, because many can not afford two separate machines, and have generally to choose which stitch they can best afford to dispense with, which sometimes is not easy to determine, as both the lock-stitch and the double-loop stitch are of nearly equal value in differentdepartments offamily sewing.

'I claim- 1. The combination of thennderthread carrier with the'needle and rotatinghook and operative parts of a Wheeler & Wilson sew ing-machine,(exceptthebobbin and ring-slide,) substantially as and for the purposes described.

2. The separate organization of the underthread carrier, with its lever, in an independent frame in such manner that it may be at once attached to the Wheeler & Wilson sewing-machine in the place of the ring-slide, so as to bring the thread-carrier and its actuating-lever in cooperative relation with the hook and needle and the cam that advances the cloth, substantially as described.

J. J. SIBLEY.

Witnesses:

F. O. TREADWELL,JI., N. D. S'rooPs. 

